Обсуждение: Question about comments

I posted this msg previously but received no responses, perhaps this
time??

I'm running Postgresql 6.3.2.

When ones gets help on the built-in commands that start with '\' there is
a command '\dd [object]'. In the comments is says that it lists the
comment for the object, eg. table, field etc.

Is this command operative under 6.3.2? If so, how does one get the
comment(s) into those objects? The '\h create table' etc gives no idea.
Also which of the system tables (pg_?) are these comments written to?

Thanks.

Cheers...Gordon
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Gordon Clarke <gordonc@cyberbiz.net.au> writes:
> I'm running Postgresql 6.3.2.

> When ones gets help on the built-in commands that start with '\' there is
> a command '\dd [object]'. In the comments is says that it lists the
> comment for the object, eg. table, field etc.

> Is this command operative under 6.3.2? If so, how does one get the
> comment(s) into those objects? The '\h create table' etc gives no idea.
> Also which of the system tables (pg_?) are these comments written to?

pg_description, I believe.  AFAIK there's no special support for adding
entries to it :-(.  You can insert entries manually, but it'd be nicer
to have some kind of specialized command for that...
        regards, tom lane

> Gordon Clarke <gordonc@cyberbiz.net.au> writes:
> > I'm running Postgresql 6.3.2.
> 
> > When ones gets help on the built-in commands that start with '\' there is
> > a command '\dd [object]'. In the comments is says that it lists the
> > comment for the object, eg. table, field etc.
> 
> > Is this command operative under 6.3.2? If so, how does one get the
> > comment(s) into those objects? The '\h create table' etc gives no idea.
> > Also which of the system tables (pg_?) are these comments written to?
> 
> pg_description, I believe.  AFAIK there's no special support for adding
> entries to it :-(.  You can insert entries manually, but it'd be nicer
> to have some kind of specialized command for that...

Yes, that is on the TODO list.  Currently, the initdb command pulls
hard-coded comments out of the include/catalog/*.h files, and loads them
in indexed on oid.  You can add your own.

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